Pontiac Repair: 2001 pontiac montanna, vacuum leak, throttle plate

Question
Sometime the van will accelerate on its own

Answer
Hi Karen:

when does it do this? Cruising down the road? At a stop light? Hot or cold? It can be a lot of things. A vacuum leak or a dirty throttle body and throttle plate is where I would start looking first. Has and service engine soon lamp come on?